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Never try to discourage thinking, for you are sure to succeed.

"The writer is a man who is in love with words, who is obsessed with words, who is possessed by words."

耐心和堅持是解開數學之謎的關鍵。

The best way to cheer yourself up is to try to cheer somebody else up.

唯一值得被稱為自由的自由是追求我們自己的幸福，以我們自己的方式，只要我們不試圖剝奪他人的自由，或妨礙他們爭取幸福的努力。

全球化思考，本地化行動。